Asiiinqton



W. F. LENT.

MOTOR CONTROLLER.

APPLICATION mno APR. a. 1.915.

TME COLUMBIA PLANOGRAPH co WASHINGTON, n, c.

ycitizen, of the United States, residing WILMAR F. LENT, OF MILWAUKEE, WISCONSIN, MFG. C0., 0F MILWAUKEE, WISCONSIN, A

ASsIGNoR To THE CUTLERHAMMER CORPORATION or WISCONSIN.

Moron-CONTROLLER.

Specication of Letters Patent. Patented July 29, 1919.

Application nled April s, 1915.' serial No. 19,885.

To all whom t may concern.'

Be it known that I, WILMAR F; LENT, a at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Motor-Controllers, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a. part of this specification.

This invention relates to motor controllers.

One of the objects of the invention is to provide an improved controller having a series wound accelerating switch with means to control said switch at will for positive and negative speed regulation.

A further object is to provide a controller having series wound accelerating switches and in conjunction therewith means for effecting step by step speed regulation thereby for both acceleration and deceleration.

Other objects and advantages will appear hereinafter in connection with the description of the accompanying drawing which diagrammatically illustrates one embodiment of the invention. Y

Referring more specifically to the drawing, there isv shown a motor M havingan amature A and a series field windin F adapted for connection across supply llnes L and Lf. A main switch 1, having a shunt operating winding, is provided to control the continuity of the motor circuit and a plurality of electro responsive accelerating switches 2, 3, 41. and 5 are provided to control armature resistances 72,13, r* and T5 respectively. The accelerating switches are of a well known type, each being provided with a series operating winding 6 for effecting operation of a pivoted contact arm 7 and with a series lock out winding 8 for holding said arm against circuit closing movement under abnormal current conditions, all in a well understood manner. The connections of the series wound switches are such that, upon closure of the motor circuit, the same tend to respond progressively and thereby effect sequential exclusion of the armature resistance sections r2 to 1-5. The switches 3 and 5 are also provided with shunt holding coils 9 adapted to maintain said switches closed after operation thereof bythe series o erating coils but `independently of the atter. The accelerating switches are4 further each provided with a shunt lock out wmding 10 adapted to act cumulatively with the series lock out winding, thereof for electromagneticallyV governing at will the closure of said switches, as will be set forth hereinafter.

A master controller 11 is provided to control the circuits of the shunt operating winding 12 of' main switch 1, the several shunt lock out windings 10 and the two shunt holding windings 9 of the accelerating switches. This controller is shown Ischematically as comprising stationary contacts 13 to 20 and a rotatable drumhaving coperating contact segments 13 to 20 respectively. The movable element of the controller is rotatable from ofi' position through five operative position a b, c, l and e to establish circuit connections as hereinafter traced. First assuming the controller to be moved directly to position e, main switch 1 rcsponds to complete the motor circuit `with all of the armature resistance included. During this movement of the controller, the shunt lock out coils 10 of the accelerating switches. are progressively energized but immediately denergized whereby they have no effect on the operation of the accelerating switches. Furthermore, the shunt holding windings 9 of the switches 3 and 5 are also energized at positions b and d of the controller so that after closure of said switches by the series operating windings thereof, they are maintained closed independently of said series windings.

Upon closure of the main switch 1 the motor circuit may be traced from line L by conductor 21 through the motor field F and armature A by conductor 22, through resistance r4, by conductor 23, through resistance r2 by conductor 24 through the series lock out winding 8 of switch 2 by conductors 25 and 26 through the series operating winding 6 of said switch, by conductor 27 through the resistance r3 by conductor 28 through resistance 115, by conductor 29 across main switch 1 and by conductor 30 to line L. As both the series operating and lock out windings of switch 2A are thus included in circuit, said switch will respond under normal current conditions, and in closing the same cuts out resistance section r2 and its own series lock out winding 8 by a circuit which includes the series operating and lock out windings of the succeeding accelerating switch 3. This last mentioned circuit is traceable from conductor 23 by conductor 31 through both the series and lockout operatingwindings of said switch .3, by con ductor 32 acrossswitch .2V to conductor 26 and thence to line L" as already traced.y Switch 3 thereupon responds to complete circuit from the left side of the resistance r* by y,conductor 33 through the series lock out winding= 8 `of switch'4, by conductors 34 and 35 through the seriesoperating .wind' ing of said switch, byV conductor 36 across switch v3', byconductor 437 to the right lhand side.v of resistance .0"5' and thence'to' line 5L. Resistance sectionfa3 is 'thus short circuited as well =as theseries lookout winding 8y of switch and the :operatingwindings` of both switches 2 and13.I Switch-2 thereupon opens, but -switch 3' is` maintained" closed Aby the shunt holding winding `'9 thereof as above mentioned-and as will appear =more specifically hereinafter. 'Switches' 4 and 5 then 'respond sequentially inaniid'entical manner tothe lprior sequential {response'of the group of i-switches'2, 3and serveto .re specti-vely `short circuit resistance r4 with the lockout -winding'S of switch 4, andresistance 75 with both the series restraining and operating windings voff-switch 5 and-the seriesoperatingwinding'of switch 4, lThe latter switch thereupon opens, but .switch 5`is maintained closedby-the shunt holding coil V'9 fthereof. Thecircuit 'completed by saidswitch '5V Amay :be *traced vfrom the -right 'sideof the armaturev by conducto`r`38 across said switch, andfby yconductor 39 to conductor 29 andv thence as traced; The Voperation described thus provides for `automatic accelerationof the motor with concomitant protection -against overloads.

As above indicated, movement of the controller 11 )to positions a., Y), c :and Z -establishes connections ifor the -shunt lock Tout windings 10 of fthe respective accelerating switches. Accordingly, by stopping ,the controller at anyoneof said lpositions the energizpation Yof the respective -shunt lock out coil may be maintained fat vwill with an attendant vfunctioningv thereof to magneticallyreStrain response of the associated ac celerating switch, Thusthe 'voluntary con trol of the resistance sections r2, r3, r" and T5 is attainedvto thereby utilize -the same for step byl step speed regulation in accelerating.' Likewise, as indicated above, th/eshunt holding winding 9 of switch 3 is energized in positions b, c, d and e ofthe controller, and the holding winding 9 of switch 5 is energizedin positions Z and e thereof. Accordingly, .movement of the controller in the reversedirection vfrom position d interrupts=the circuit of-thes'hunt holding wind*- ing 9 of switch 5 so l*that said switch opens and :thereby includes 1n the motor circuit the two resistance sectionsva5 and r4. Gontinued movement ofthe controller from p0- sition 'b to position a similarly interrupts the circuit of the shunt holding winding of switch 3v which ,thereupon Aopens to include ,the remainingsections'r2 and r3 of vthe armature resistance. 'This reverse operation of .thecontroller thus provides for a limited step by step speed regulation in decelerat- .ing "either position c or a the controller is operyfable forward-ly :to re-accelerate without an It will be observed also .that from intervening interruption of the motor circuit. Vliilev the'control circuits are readily'discernible the same may -be briefly traced as follows: "Circuit .ofthe shunt winding of switch 1 extends lfromline L by conductor 40, fthroughthe winding, by conductor41 acrosscontacts 14, 14', 13' and' 13 offthe controller and by conductor 42 -to line L". The shunt flock-out windings -10 of the accelerating switches are allfconnectedQby conductors43 and 21 to 'line f'L and on theother side le'ad through conductors 44,45, 46 and 471to`the stationary contacts 15, 16, -18 fand k19 respectively of the controller and through the "corresponding movable con tacts of the latter 'to contact 13 and byconductor 42 to the line L. vThe shunt Eholding windings 9 of the accelerating switches 3 and 5 are likewise connectedIbyconductors 48 -and 21 to lline L and on vthe other Side by conductors 49 and 50 tostationaryrontacts .17, 20 of the controller -and tlniough the corresponding -Y contact segmentsvof `the latter to lline L as already traced. The controller contacts Aare arranged as Findicated to complete the following circuits in the respective controller positions: In 'position a, to energize the. operating' winding of main switch lf-'and the 'shunt Ylocle-'out winding of the'first accelerating switch 2; in position'` Z), to interrupt-.the circuitof said lock out winding yof switch 2 and'energize the shunt lockout ywinding 10 and shunt holding winding 9 ofswitch 3; in position c, `to vinterruptfthe circuit of said lock out lwinding-'of switch l3 while continuing the energization of the shunt holding winding 9- of Ysaid'switch and completing circuit to Vtheshuntlock-out windingA of switch 4-';in

position cZ, to interrupt the circuit of said '-115 vconfined to a non-reversible motor having a kseries field winding, it is Ato be understood that the controller is susceptible-of applicavtion as well in Vvarious yotherrelation's with motors having other characteristics. Furthermore, the controller may be embodied in Variousother forms. For example, the controller might be employed for electing speed regulation in acceleration only, in which case the shunt holding windings 9 of the accelerating switches 3 and 5 vmight be eliminated and the connections of said switches arranged similarly to the switches 2 and 4.

What I claim as new and desire to secure by Letters Patent is:

1. In a motor controller, the combination with a series wound acceleratin switch acting upon response thereof to` s unt its operating winding, of means controllable at will and independently of said operating/ winding to restrain said switch against response and to hold said switch after response thereof.

2. In a motor controller, the combination with a series wound accelerating switch acting upon response thereof to shunt its operating winding, of windings to restrain said switch against response and to hold the same after response thereof and means to control said restraining and holding windings at will for acceleration and deceleration of the controlled motor.

3. In amotor controller, the combination with an accelerating switch having series operating and lockout windings, said switch Y upon response thereof acting to shunt its operating winding, ofr means independent of said windings to render said switch controllable at will for acceleration and deceleration of the controlled motor.

4. In a motor controller, in combination, means adapted to control the continuity of circuit of the controlled motor, a plurality of series wound accelerating switches, certain of the same acting upon response thereof to shunt their respective operating windings and means to hold a plurality of switches in closed position and to subject the same to release at will for deceleration of the motor to dillerent degrees.

5. In a motor controller, in combination, means adapted to control the continuity of circuit of the controlled motor, a plurality of series wound accelerating switches and means subjecting said switches to control at will for increasing and decreasing the motor speed step by step, the series windings of said'switches being independent of said means.

6. In a motor controller, in combination, electromagnetic means adapted to control the continuity of circuit of the motor, a lurality of series wound accelerating switc es,

certain of said accelerating switches also having shunt windings for restraining them against operation and holding the same after operation and a common controller for said means and said shunt windings to provide for acceleration and deceleration Aof the controlled motor at will.

7 In a motor controller, in combination, means adapted -to control the continuity of circuit of the controlled motor, a plurality of series wound accelerating switches and electromagnetic means subjecting said switches to control at will for ste by step acceleration and deceleration of t e motor, the series windings of said switches being independent of said electromagnetic means.

8. In a motor controller, in combination, means adapted to control the continuity of circuit of the motor, an electro-responsive accelerating switch having a series operating and a series lock out winding, and means including a shunt lock out winding to coperate with said series lock out winding for controlling said switch.

9. In a motor controller, in combination, means adapted to control the continuity of circuit of the motor, an accelerating switch having series operating and lock windings, a shunt lock out winding associated with said series lock out winding to control response of said switch, and a shunt holding winding to maintain said switch closed independently of said series operating winding.

10. In a motor controller, in combination, means adapted to control the continuity of circuit of the motor, a plurality of groups of accelerating switches having series operating windings, each of said groups including a plurality of said switches and one switch of each group upon closure short circuiting the series operating windings of the switches of its respective group, and means to control said one of said switches at will while the motor circuit is completed.

11. In a motor controller, in combination, means adapted to control the continuity of circuit of the motor, a plurality of groups of accelerating switches having series operating windings, each of said groups including a plurality of said switches and one switch of each group upon closure short circuiting the series operating windings of the switches of its respective group, and means to control each of said switches at will in accelerating and to control said one switch of each group at will in decelerating.

In witness whereof, I have hereunto subscribed my name.

WILMAR F. LENT.

copies of thil potent moy be obtained for nve cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

